Quote:
Originally posted by Exulus
mmmm, thats confusing but in this last step:
2(a^2 - ab) = 1(a^2 - ab)
You say that a and b are the same, and so the bits in the brakets will always equal 0, so you are just saying 0=0? 
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Yep. And when you cancel out you are dividing zero by zero, which is indeterminate.